The SPT-ZK-53U Zakaal is the custom personal unit of Admiral Gresco's son, Le Cain. As befitting a member of the ruling class, the Zakaal is gold colored and decorated with an ornate crest on its left shoulder. The Zakaal's armaments include a claw-like arm horn mounted on the left arm and a lasered rifle, but it also holds a secret that not even Le Cain is aware of. Dr. Nizon, an SPT researcher, reveals to Le Cain that all next generation SPTs constructed since 1996 contain an experimental V-MAX system resembling the one pioneered in the SPT-LZ-00X Layzner. The feature is locked away by default due to the deaths of test pilots who were unable to control V-MAX. However, Le Cain proves in a combat simulator that he can easily master V-MAX and the additional "red power" super charge that boosts V-MAX an extra 15 percent. Thanks to the "red power," Le Cain is able to inflict heavy damage on Layzner. On December 30, 1999, Le Cain heads into space to stop the Seal of Grados and fights Eiji Asuka's E-SPT-LZ-00X-B New Layzner. The battle proves inconclusive and is ended when Le Cain is taken away inside the Seal and the Zakaal is abandoned in space, its fate unknown.